Atlas Copco Check Valve Service Kit Replacement – 2906066000

Atlas Copco 2906066000 – Check Valve Service Kit

The Atlas Copco 2906066000 (2906-0660-00) Check Valve Service Kit is a maintenance kit used in compatible stationary oil-free compressor systems. Its primary function is to maintain reliable one-way compressed-air flow and prevent reverse airflow from the downstream air system back toward the compressor.

Working Process:

During normal compressor operation, compressed air generated by the compressor flows through the discharge circuit toward the downstream air network. The check valve opens when the pressure on the compressor side becomes greater than the downstream pressure, allowing compressed air to pass through the valve.

The internal valve elements move away from their sealing surfaces under the pressure differential. This creates a flow passage through which compressed air can travel toward the receiver, air-treatment equipment, or downstream process system.

During normal loaded operation, the valve remains open as long as sufficient forward pressure is available. It provides the required airflow while maintaining separation between the compressor discharge side and the downstream system.

When the compressor unloads or stops, the pressure differential changes. Downstream pressure can remain higher than the pressure on the compressor side. The spring then assists in moving the valve elements back toward their seats.

Once the valve closes, it prevents compressed air from flowing backward toward the compressor. This protects the compressor discharge circuit from reverse pressurization and prevents unwanted pressure equalization during unloading and shutdown.

Atlas Copco’s official product listing identifies 2906066000 as a “CHECK VALVE SERVICE KIT FOR OIL FREE COMPRESSORS.” The official component list includes:

• Valve – 1 pc
• O-ring – 2 pcs
• O-ring 89.5 × 3 – 1 pc
• Spring – 1 pc
• Valve – 1 pc
• O-ring – 1 pc
• Bushing – 1 pc
• O-ring – 1 pc

These components work together to restore the check valve’s mechanical movement, closing action, and sealing performance.

The valves provide the primary one-way flow-control function. The spring provides the closing force when forward pressure decreases. The bushing supports correct positioning and movement of the valve components, while the O-rings provide sealing between the valve assembly and housing.

The check valve operates repeatedly during compressor loading, unloading, and shutdown. Over time, the internal components can be affected by pressure fluctuations, vibration, temperature changes, contamination, and mechanical wear.

A worn or damaged check valve may fail to close completely. This can allow compressed air to flow backward into the compressor circuit, causing pressure loss, abnormal unloading behavior, pressure equalization, and possible additional loading of compressor components.

If the valve becomes restricted or fails to open correctly, it can create additional pressure drop and reduce the efficiency of compressed-air delivery.

During maintenance, the compressor must be stopped, electrically isolated, completely depressurized, and allowed to cool before servicing the check valve.

The existing valve components should be removed according to the applicable Atlas Copco service procedure. The valve seats, valve elements, spring, bushing, O-rings, and internal passages should be inspected for wear, deformation, contamination, corrosion, or damage.

The worn components should be replaced using the 2906066000 Check Valve Service Kit. O-rings must be installed carefully without twisting, cutting, or damaging the sealing surfaces. The spring, valves, and bushing must be installed in their correct positions and orientations.

After reassembly, the valve assembly should be checked for correct movement and leakage. The compressor should then be operated through its start-up, loaded, unloaded, and shutdown cycles.

During testing, the check valve should open smoothly during forward airflow and close securely when the pressure differential reverses.

A properly maintained check valve helps maintain pressure stability, prevents reverse airflow, protects the compressor during shutdown, and supports reliable oil-free compressor operation.

Using the Atlas Copco 2906066000 Check Valve Service Kit during scheduled maintenance helps restore one-way airflow control, sealing performance, correct valve movement, and dependable compressor operation.

Part Number: 2906066000
Alternative Number: 2906-0660-00 / 2906 0660 00
Brand: Atlas Copco
Part Description: Check Valve Service Kit
Official Description: Check Valve Service Kit for Oil-Free Compressors
Component Type: Check / non-return valve service kit
Application: Stationary oil-free compressors
Primary Function: Allows forward compressed-air flow and prevents reverse flow
Main Components: Valves, spring, bushing, and O-rings
Operating Function: Controls one-way airflow during normal operation, unloading, and shutdown
Main Benefits: Reverse-flow protection, pressure stability, reliable sealing, reduced leakage, compressor protection, and dependable operation.

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